Namura Standard Bore Top End Kit for Polaris Big Boss 250 4x6 6x6 1989-1993 72mm

Standard Bore Top End Kit for Polaris

This Namura Standard Bore Top End Kit provides all necessary components to rebuild the top end of a Polaris Big Boss 250 engine. Designed for 1989-1993 models, this 72mm bore kit restores compression and power. The Standard Bore Top End Kit is a reliable replacement for worn-out pistons, rings, and gaskets.

Overview

This Namura Standard Bore Top End Kit is a direct-fit aftermarket top end assembly for Polaris Big Boss 250 utility vehicles from 1989 to 1993. It includes a piston, rings, wrist pin, circlips, and gaskets to completely rebuild the cylinder. The 72mm standard bore size ensures compatibility with the original cylinder.

Built For Performance

• Includes complete piston, rings, wrist pin, and circlips
• Machined to precise tolerances for consistent compression
• Heat-treated components for long-term durability
• Direct fit for Polaris Big Boss 250 4x6 and 6x6 models
• Kit includes all necessary gaskets for installation

Fits These Machines

• for Polaris Big Boss 250 4x6 (1989-1993)
• for Polaris Big Boss 250 6x6 (1989-1993)

On-The-Job Use

• Used for agricultural and utility work
• Designed for off-road trail riding
• Restores engine power on aging Big Boss models
• Commonly used in recreational off-road driving

Specs At A Glance

Good To Know

Q: Is this kit compatible with 4x6 and 6x6 models? A: Yes, it fits both Polaris Big Boss 250 4x6 and 6x6 models from 1989 to 1993.

Q: What gaskets are included? A: The kit includes all necessary base and head gaskets for a complete installation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.